ABB Relion 650 Series Technical Manual page 282

Section 9
Secondary system supervision
DVDI Detection
IA
DIPU
VA
DVPU
VPPU
IB
VB
IC
VC
VA
IA
50P
52A
VB
IB
VC
IC
ANSI10000034 V1 EN-US
Figure 141: Simplified logic diagram for DV/DI detection part
276
DVDI detection Phase 1
One cycle
delay
One cycle
delay
20 ms 1.5 cycle
a
a>b
t
t
b
DVDI detection Phase 2
Same logic as for phase 1
DVDI detection Phase 3
Same logic as for phase 1
a
a<b
b
a
a>b
b
AND
OR
AND
a
a<b
b
a
a>b
b
AND
OR
AND
a
a<b
b
a
a>b
b AND
OR
AND
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|DI|
a
a>b
b
|DV|
a
a>b
AND
b
AND
OR
AND
OR
AND
OR
OR
Reclosing_Reclaim_and_Inhibit_timers%3DANSI100
00257%3D1%3Den%3DOriginal[1].vsd
1MRK 506 326-UUS B
FuseFailDetDVDI
Line distance protection REL650
Technical manual